Hi Gio78:
I have just arrived from my trip to Moscow, and I am really sorry to tell you there are more renovations and things you'll miss. Bolshoi is indeed in renovations and its even surrounded by fences, so no chance to see it really. Moreover, Lenin's tomb is being repaired and it wont be opened until the 17th of April. One of the buildings of the red square is also being repaired and it has scaffolding. I dont know exactly what it is, because in that way i couldnt see it. The Novodevichy convent has also a scaffolding in the Church of Transfiguration gate (the main entrance) plus the Cathedral of Smolensk is being repaired (doesnt open until the end of May) so, you cant go inside (the exterior is intact). One of the churches in the Kremlin was closed too when i went and also another one which is a musseum nowadays. Thats all the renovations I have found in my trip. I hope they are useful to you :)